to heat seal (versiegeln vs. verschweissen)

German translation: heisssiegeln

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for closing plastic wrappings. I feel verschweissen is more colloquial, versiegeln used more in technical literature, sometimes they are used as synonyms.
But are they really?
To me, verschweissen means melting the material, versiegeln not necessarily.
Which one would you think has a larger meaning (I'm translating a patent, so my translation should, if possible, cover all possible meanings of heat seal...)

Thank you Sabine - and all the others as well, I really appreciated getting several opinions. I would have liked to give Kudoz points to all of you, but since Sabine answered my most important question - which one has the largest meaning - I award the Kudoz points to her.3 KudoZ points were awarded for this answer

Thank you Sabine - and all the others as well, I really appreciated getting several opinions. I would have liked to give Kudoz points to all of you, but since Sabine answered my most important question - which one has the largest meaning - I award the Kudoz points to her.